I'm sure of it, its PPS... The only problem with it, is like I said, you get paid even if no blocks are found. Risk for reward
A) Slush is NOT PPS
B) You do NOT get paid more on a PPS pool. You just get less variance. The miner is assuming NO extra risk on a PPS pool, so why would he make more? It's the pool operator that is taking a risk.
That is a half truth. IF the pool has enough BTC in reserve, it will pay you out regardless of whether the shares you contributed amounted to solving a block or not. now, IF the pool DOES NOT have enough BTC in reserve, and you contribute X amount of shares towards a block which amounts to nothing, then the pool has an obligation (and I use the term obligation loosely) to pay you out for each share even if the pool did not solve a block. Then the owner of the pool has to make a decision. A. Pay out of his own pocket the BTC owed to you, OR B. Bankrupt the Pool and leave you high and dry....It has happened. research Bitclockers.com - the pool tried pay PPS at a less than 3% rake and the pool went bankrupt. alot of people lost alot of coin because of this. I personally lost .29 BTC but it was enough to make me pay attention to how a pool operates much more acutely.
PPLNS is different as it will never pay out more than the pool brings in. Ultimately, its up to you, if you wanna risk it with PPS, and you feel comfortable with it, go ballz deep.. no problem. Just know what your getting into.
On a side note, One lesson learned by a lot of people over at bitclockers is that anyone who is mining large amounts of coin should not leave it inside the pool. Set your auto payout triggers to something low so that you will know IF and/or a pool is having a problem paying its miners.